As for what I did to cause this, I don't really know. I did some cleaning on Saturday, then my hand started hurting. At first I thought it was arthritis, but it kept getting worse. Icing and Arnica cream seemed to help. When I'm on my laptop (my only computer) the edge tends to hit my wrists. I don't think that's what did it, but I do feel it's something I need to address. I need to protect my wrists. I have an Incrediwear wrist brace that I'm wearing right now. It's very comfortable. I think I need to wear it more often. Wrists tend to be delicate and I could take a proactive approach, instead of waiting until I have a sprain.